Spin-wave eigenmodes in direct-write 3D nanovolcanoes

O. V. Dobrovolskiy; N. R. Vovk; A. V. Bondarenko; S. A. Bunyaev; S. Lamb-Camarena; N. Zenbaa; R. Sachser; S. Barth; K. Y. Guslienko; A. V. Chumak; M. Huth; G. N. Kakazei

doi:10.1063/5.0044325

Titel

Spin-wave eigenmodes in direct-write 3D nanovolcanoes

Autor*in

O. V. Dobrovolskiy

Fakultät für Physik, Universität Wien

N. R. Vovk

Institute of Physics for Advanced Materials, Nanotechnology and Photonics (IFIMUP)/Departamento de Física e Astronomia, Universidade do Porto

A. V. Bondarenko

Institute of Physics for Advanced Materials, Nanotechnology and Photonics (IFIMUP)/Departamento de Física e Astronomia, Universidade do Porto

... show all

Abstract

Extending nanostructures into the third dimension has become a major research avenue in modern magnetism, superconductivity, and spintronics, because of geometry-, curvature-, and topology-induced phenomena. Here, we introduce Co–Fe nanovolcanoes—nanodisks overlaid by nanorings—as purpose-engineered 3D architectures for nanomagnonics, fabricated by focused electron beam-induced deposition. We use both perpendicular spin-wave resonance measurements and micromagnetic simulations to demonstrate that the rings encircling the volcano craters harbor the highest-frequency eigenmodes, while the lower-frequency eigenmodes are concentrated within the volcano crater, due to the non-uniformity of the internal magnetic field. By varying the crater diameter, we demonstrate the deliberate tuning of higher-frequency eigenmodes without affecting the lowest-frequency mode. Thereby, the extension of 2D nanodisks into the third dimension allows one to engineer their lowest eigenfrequency by using 3D nanovolcanoes with 30% smaller footprints. The presented nanovolcanoes can be viewed as multi-mode microwave resonators and 3D building blocks for nanomagnonics.

Stichwort

SpintronicsMagnetic orderingMagnetic resonanceWaveguidesElectron beam-induced depositionMicrowave spectroscopySpin wave spectroscopy

Objekt-Typ

journal article

Sprache

Englisch [eng]

Persistent identifier

phaidra.univie.ac.at/o:1653544

DOI

10.1063/5.0044325

Erschienen in

Titel